From: Edward Adam Davis <eadavis@qq.com>
Date: Sun, 8 Sep 2024 09:17:41 +0000 (+0800)
Subject: USB: usbtmc: prevent kernel-usb-infoleak
X-Git-Tag: v6.12-rc1~42^2~26
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=625fa77151f00c1bd00d34d60d6f2e710b3f9aad;p=thirdparty%2Fkernel%2Flinux.git

USB: usbtmc: prevent kernel-usb-infoleak

The syzbot reported a kernel-usb-infoleak in usbtmc_write,
we need to clear the structure before filling fields.

Fixes: 4ddc645f40e9 ("usb: usbtmc: Add ioctl for vendor specific write")
Reported-and-tested-by: syzbot+9d34f80f841e948c3fdb@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=9d34f80f841e948c3fdb
Signed-off-by: Edward Adam Davis <eadavis@qq.com>
Cc: stable <stable@kernel.org>
Link: https://lore.kernel.org/r/tencent_9649AA6EC56EDECCA8A7D106C792D1C66B06@qq.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 6bd9fe5653858..34e46ef308abf 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -754,7 +754,7 @@ static struct urb *usbtmc_create_urb(void)
 	if (!urb)
 		return NULL;
 
-	dmabuf = kmalloc(bufsize, GFP_KERNEL);
+	dmabuf = kzalloc(bufsize, GFP_KERNEL);
 	if (!dmabuf) {
 		usb_free_urb(urb);
 		return NULL;